平面结构一级超声跟踪时的布拉格带宽和声光器件的最佳设计

The Bragg Bandwidth of the First-Order Beam Steering with Plane Configuration and the Optimum Design of Acoustooptic Devices

摘要: 通过对确定频率响应(P_a(F))/(N_e²P_ao)~F的一般公式的理论分析,证明在所有情况下,频率响应曲线对中心频率F=1对称的条件均为F₁+F₂=2;在此基础上,对各种换能器片数N_e计算确定了可能达到的最大布拉格带宽,并得到器件的最佳设计。

Abstract: According to the theoretical analysis of the general formulas deter-mining the frequency response (P_a(F))/(N_e²P_ao)~F, it is proved that, underany circumstance, the condtion that the frequency response curves are symmetric about the central frequency F=1 is always F₁+F₂=2. Based upon this argument, we determine, through systematical calculations, the largest Bragg bandwith which can be obtained for various number of transducer pieces N_e. At the same time, we obtain the optimum design of acoustooptic devices.